If You Can Hold a Side Plank for This Long, Your Core Is Stronger Than 90% of People
Think your core is strong? Research shows that holding a side plank for this long puts you in the top 10% of strength. Find ...
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Hold a Side Plank This Long to Prove Your Core Strength Is Unstoppable
RELATED: 10 Best Plank Variations to Sculpt a Lean, Mean Six-Pack -Begin by laying on one side with your legs straight and feet stacked on top of the other. -You want your bottom forearm directly ...